Which thermal insulation board material is specified in your EWI system will be based on a number of factors including the cost, thermal performance levels required, space available and the construction type. The following rigid insulation board options are available for use as part of our webertherm external wall insulation systems:
webertherm insulation options
webertherm EPS
webertherm EPS is the most popular product used in external wall insulation. It is a cost effective yet durable product and is lightweight, non-toxic, and is completely recyclable. It is easy to install and will perform for the lifetime of the building.
The expanded polystyrene insulation board has fantastic thermal properties with a thermal conductivity lambda value of 0.030 W/mK
- Available in a standard 1200x600mm size and in a range of 20-200mm thicknesses
- Forms part of a BBA and NSAI Certified Systems
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The webertherm EPS polystyrene wall insulation board is supplied as Reaction to Fire Class E, containing a flame-retardant additive
webertherm PHS
webertherm PHS is a more expensive form of external insulation but the thermal properties of the PHS board are very high – so you can achieve the same thermal properties with much thinner material, which may be crucial for some projects.
The phenolic board has exceptional thermal properties with a thermal conductivity lambda value of between 0.020 W/m K and 0.023 W/m K depending on the insulation thickness.
- Available in a standard 1200x600mm size and in a range of 20-70mm thicknesses, other sizes available on demand
- Forms part of a BBA and NSAI Certified Systems
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webertherm PHS achieves Class 0 Rating, as defined by Approved Document B in England and Wales, and Technical Booklet E in Northern Ireland. It also achieves medium risk, as defined in the Technical Handbook in Scotland.
webertherm MFD
webertherm MFD thermal properties are similar to EPS, but is slightly more expensive to install. It does however have additional benefits. Mineral wool insulation is non-combustible and is also good at absorbing acoustics where noise pollution may be an issue.
The mineral fibre insulation board has a thermal conductivity lambda value of 0.035 W/m K.
- Available in a standard 1200x600mm size and in a range of 30-200mm thicknesses
- Forms part of a BBA and NSAI Certified Systems
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webertherm MFD achieves the highest Euroclass Fire Rating of A1 which negates the need to install fire barriers
Other types of external wall insulation boards
Other insulation materials are available dependant on the requirement and specification. External wall insulation suitable for fire breaks and below DPC are available, please contact the Weber technical department or your local Weber representative for more information.
Brochures and Guides
- Brochure Refurbishment Guide ( - )
- Brochure External Wall Insulation System Guide (PDF - 1,08 MB) Download • Send
